/**
 * $RCSfile$
 * $Revision$
 * $Date$
 *
 * Copyright 2003-2007 Jive Software.
 *
 * All rights reserved. Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.jivesoftware.smackx.provider;

import org.jivesoftware.smack.packet.PacketExtension;
import org.jivesoftware.smack.provider.PacketExtensionProvider;
import org.jivesoftware.smackx.FormField;
import org.jivesoftware.smackx.packet.DataForm;
import org.xmlpull.v1.XmlPullParser;

import java.util.ArrayList;
import java.util.List;

/**
 * The DataFormProvider parses DataForm packets.
 * 
 * @author Gaston Dombiak
 */
public class DataFormProvider implements PacketExtensionProvider {

	/**
	 * Creates a new DataFormProvider. ProviderManager requires that every
	 * PacketExtensionProvider has a public, no-argument constructor
	 */
	public DataFormProvider() {
	}

	public PacketExtension parseExtension(XmlPullParser parser)
			throws Exception {
		boolean done = false;
		StringBuilder buffer = null;
		DataForm dataForm = new DataForm(parser.getAttributeValue("", "type"));
		while (!done) {
			int eventType = parser.next();
			if (eventType == XmlPullParser.START_TAG) {
				if (parser.getName().equals("instructions")) {
					dataForm.addInstruction(parser.nextText());
				} else if (parser.getName().equals("title")) {
					dataForm.setTitle(parser.nextText());
				} else if (parser.getName().equals("field")) {
					dataForm.addField(parseField(parser));
				} else if (parser.getName().equals("item")) {
					dataForm.addItem(parseItem(parser));
				} else if (parser.getName().equals("reported")) {
					dataForm.setReportedData(parseReported(parser));
				}
			} else if (eventType == XmlPullParser.END_TAG) {
				if (parser.getName().equals(dataForm.getElementName())) {
					done = true;
				}
			}
		}
		return dataForm;
	}

	private FormField parseField(XmlPullParser parser) throws Exception {
		boolean done = false;
		FormField formField = new FormField(parser.getAttributeValue("", "var"));
		formField.setLabel(parser.getAttributeValue("", "label"));
		formField.setType(parser.getAttributeValue("", "type"));
		while (!done) {
			int eventType = parser.next();
			if (eventType == XmlPullParser.START_TAG) {
				if (parser.getName().equals("desc")) {
					formField.setDescription(parser.nextText());
				} else if (parser.getName().equals("value")) {
					formField.addValue(parser.nextText());
				} else if (parser.getName().equals("required")) {
					formField.setRequired(true);
				} else if (parser.getName().equals("option")) {
					formField.addOption(parseOption(parser));
				}
			} else if (eventType == XmlPullParser.END_TAG) {
				if (parser.getName().equals("field")) {
					done = true;
				}
			}
		}
		return formField;
	}

	private DataForm.Item parseItem(XmlPullParser parser) throws Exception {
		boolean done = false;
		List fields = new ArrayList();
		while (!done) {
			int eventType = parser.next();
			if (eventType == XmlPullParser.START_TAG) {
				if (parser.getName().equals("field")) {
					fields.add(parseField(parser));
				}
			} else if (eventType == XmlPullParser.END_TAG) {
				if (parser.getName().equals("item")) {
					done = true;
				}
			}
		}
		return new DataForm.Item(fields);
	}

	private DataForm.ReportedData parseReported(XmlPullParser parser)
			throws Exception {
		boolean done = false;
		List fields = new ArrayList();
		while (!done) {
			int eventType = parser.next();
			if (eventType == XmlPullParser.START_TAG) {
				if (parser.getName().equals("field")) {
					fields.add(parseField(parser));
				}
			} else if (eventType == XmlPullParser.END_TAG) {
				if (parser.getName().equals("reported")) {
					done = true;
				}
			}
		}
		return new DataForm.ReportedData(fields);
	}

	private FormField.Option parseOption(XmlPullParser parser) throws Exception {
		boolean done = false;
		FormField.Option option = null;
		String label = parser.getAttributeValue("", "label");
		while (!done) {
			int eventType = parser.next();
			if (eventType == XmlPullParser.START_TAG) {
				if (parser.getName().equals("value")) {
					option = new FormField.Option(label, parser.nextText());
				}
			} else if (eventType == XmlPullParser.END_TAG) {
				if (parser.getName().equals("option")) {
					done = true;
				}
			}
		}
		return option;
	}
}
